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Discontinued Operations and Disposition of Subsidiaries - Summary of Net Loss from Discontinued Operations (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of analysis of single amount of discontinued operations [line items] |  |
Revenue | $ 4,283.8 | $ 4,028.7
Income before income taxes and discontinued operations | 226.3 | 263.5
Net loss from discontinued operations | (123.9) |
Construction services group [member] | Discontinued operations [member] |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |
Revenue | 884.4 | 1,111.4
Expenses | (953.8) | $ (1,111.4)
Impairment of goodwill | (53.0) |
Income before income taxes and discontinued operations | (122.4) |
Income taxes on operating activities | 10.8 |
Loss from operating activities, net of income taxes | (111.6) |
Gain on disposal of discontinued operations before income taxes | 1.5 |
Income taxes on disposal of discontinued operations | (13.8) |
Loss on disposal of discontinued operations, net of income taxes | (12.3) |
Net loss from discontinued operations | $ (123.9) |

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